[iptables] libiptc: guard chain index allocation for different malloc implementations

[Patrick McHardy]

Gitweb:		http://git.netfilter.org/cgi-bin/gitweb.cgi?p=iptables.git;a=commit;h=0eee3009e7015b82a46b2eccad91f759d75ec4df
commit 0eee3009e7015b82a46b2eccad91f759d75ec4df
Author:     Jan Engelhardt <jengelh at medozas.de>
AuthorDate: Wed Nov 26 17:18:08 2008 +0100
Commit:     Patrick McHardy <kaber at trash.net>
CommitDate: Wed Nov 26 17:18:08 2008 +0100

    libiptc: guard chain index allocation for different malloc implementations
    
    Some libc implementations such as µClibc return NULL on malloc(0).
    They are free to do that per C standard.
    
    Signed-off-by: Jan Engelhardt <jengelh at medozas.de>
    Signeed-off-by: Patrick McHardy <kaber at trash.net>
       via  0eee3009e7015b82a46b2eccad91f759d75ec4df (commit)
      from  64f948b24407c3cf3d02476059a3f9fa0265cb3d (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
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- Log -----------------------------------------------------------------
commit 0eee3009e7015b82a46b2eccad91f759d75ec4df
Author: Jan Engelhardt <jengelh at medozas.de>
Date:   Wed Nov 26 17:18:08 2008 +0100

    libiptc: guard chain index allocation for different malloc implementations
    
    Some libc implementations such as µClibc return NULL on malloc(0).
    They are free to do that per C standard.
    
    Signed-off-by: Jan Engelhardt <jengelh at medozas.de>
    Signeed-off-by: Patrick McHardy <kaber at trash.net>

-----------------------------------------------------------------------

 libiptc/libiptc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
Some libc implementations such as µClibc return NULL on malloc(0).
They are free to do that per C standard.

Signed-off-by: Jan Engelhardt <jengelh at medozas.de>
Signeed-off-by: Patrick McHardy <kaber at trash.net>

diff --git a/libiptc/libiptc.c b/libiptc/libiptc.c
index 13e4c69..544a5b2 100644
--- a/libiptc/libiptc.c
+++ b/libiptc/libiptc.c
@@ -503,7 +503,7 @@ static int iptcc_chain_index_alloc(struct xtc_handle *h)
 	      array_elems, array_mem);
 
 	h->chain_index = malloc(array_mem);
-	if (!h->chain_index) {
+	if (h->chain_index == NULL && array_mem > 0) {
 		h->chain_index_sz = 0;
 		return -ENOMEM;
 	}